Quote Originally Posted by Chromophore
So, my main questions and concerns at this point...

1. Will these plants stretch too much during flowering? As of day 1 of 12/12, they are 21" from the glass panel of the HPS. I can buy another 4" by raising the light, then I'm out of options.

2. Do the plants need to be further thinned/spread apart? I'm in a quandry over whether to spread them out to give more light access to lower growth, or keep things bunched under the light to increase exposure at the tops.

3. Has anyone here used supplemental UVB lighting during flowering? If so, what are your thoughts/recommendations on that?
I use cfl's for side & underlighting because of the higher uv's, but I'm not sure if its uva or uvb. It helps pack on the trichromes & aids ripening.
-- I am so fortunate to have good water, but not everybody can have their own spring. City water is vile. You almost need a reverse osmosis system to make it drinkable. Do you have the space to set up a few 5 gallon buckets? If you do, get a decent sized air pump & some of the old fashioned fish tank filters (the ones using loose charcoal & floss) & run them for a couple days before using. Not only will it be better for your plants, but it will be much better for drinking too. I really hate municipal water.
-- Relax & enjoy your plants. Sounds like you're trying too hard.